What are everyday applications of Newton's First Law?
Read
Newton's First Law (law of inertia): An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Everyday applications: A person's body stays in motion when when a car brakes and stops.
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b) Inertia and Mass
Survey
Questions
What was Galileo's concept of inertia?
Why don't forces keep objects moving?
How is mass a measure of the amount of inertia?
Read
Galileo's concept of inertia: Moving objects eventually stop because of a force called friction.
Why forces don't keep objects moving: An object in motion on a flat surface does not stop because of the absence of a force; but because of the presence of a force (friction). In the absence of friction, the object would continue in motion with the same speed and direction forever.
How mass is a measure of the amount of inertia: The tendency of an object to resist changes in its state of motion varies with mass. The more inertia an object has, the more mass it has. A more massive object has a greater tendency to resist changes in its state of motion.
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c) State of Motion
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Questions
What does the phrase "state of motion" mean?
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An object's state of motion: The state of motion of an object is defined by its velocity.
Inertia
The tendency of an object to resist changes in its velocity
The tendency of an object to resist accelerations
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d) Balanced and Unbalanced Forces
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Questions
What are balanced and unbalanced forces?
What is equilibrium?
Read
Balanced and unbalanced forces:
Balanced forces-forces acting upon an object that are of equal magnitude and in opposite directions
Unbalanced forces-forces acting upon an object that are not of equal magnitude and are not in opposite directions.
Equilibrium: When there are no unbalanced forces acting upon an object and the object maintains its state of motion. It will not accelerate.
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Homework Assignment 2-Force and Its Representation (a-d):Method 4
a) The Meaning of Force
Survey
Question
What is the meaning of force?
What are contact forces?
What are at-a-distance-forces?
What is a Newton?
Read
Meaning of force: A force is a push or pull upon an object resulting from the object's interaction with another object. When the interaction ceases, the two objects no longer experience the force.
Contact forces: Contact forces result when the two interacting objects are perceived to be physically contacting each other.
Examples: frictional forces, tensional forces, normal forces, air resistance forces, and applied forces.
At-a-distance-forces: At-a-distance-forces result when the two interacting objects are not in physical contact with each other, but are able to exert a push or pull despite their physical separation.
Examples: gravitational forces, electrical forces, magnetic forces.
Newton: A Newton is a standard metric union that measures force.
external image u2l2a2.gif
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b) Types of Forces
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Question
What are the different types of forces?
What is the different between weight and mass?
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Types of forces:
Applied force - A force that is applied to an object by a person or another object.
Gravity force - The force with which the earth, moon, or other massively large object attracts another object towards itself; weight of the object.
Normal force - The support force exerted upon an object that is in contact with another stable object.
Friction force -The force exerted by a surface as an object moves across it or makes an effort to move across it.
Air resistance force - A special type of frictional force that acts upon objects as they travel through the air.
Tension force - The force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.
Spring force - The force exerted by a compressed or stretched spring upon any object that is attached to it.
Mass vs. weight: Weight is the force of gravity acting upon an object and mass is the amount of matter that is contained by the object.
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c) Drawing Free-Body Diagrams
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Question
What are free-body diagrams?
How do you draw free-body diagrams?
Read
Free-body diagrams: Vector diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.
How to draw free body diagrams: The only rulefor drawing free-body diagrams is to depict all the forces that exist for that object in the given situation
Identify which forces are present
Determine the direction in which each force is acting
Draw a box and add arrows for each existing force in the appropriate direction
Label each force arrow according to its type and if there are repeating forces make sure to alter the name in some way, example: T1, T2
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d) Determining the Net Force
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Question
What is net force, and how do you determine an object's net force?
How do you determine an object's net force?
Read
Net force: Net force is the vector sum of all the forces that act upon an object and is determined by finding this sum.
Net force takes into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out
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Homework Assignment 3-Newton's Second Law of Motion (a, b):Method 4
a) Newton's Second Law
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Question
What is Newton's Second Law of Motion?
What equation is used for Newton's Second Law?
Read
Newton's Second Law: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
Fnet= mas*acceleration
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b) The Big Misconception
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Question
What is the big misconception?
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The Big Misconception: The idea that sustaining motion requires a continued force
Newton's laws declare loudly that a net force (an unbalanced force) causes an acceleration; the acceleration is in the same direction as the net force
Table of Contents
Chapter 4
Homework Assignment 1-Newtons Laws (a-d):Method 4
a) Newton's First LawSurvey
Questions
- What is Newton's First Law?
- What are everyday applications of Newton's First Law?
Read- Newton's First Law (law of inertia): An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
- Everyday applications: A person's body stays in motion when when a car brakes and stops.
Recite and reviewb) Inertia and Mass
Survey
Questions
- What was Galileo's concept of inertia?
- Why don't forces keep objects moving?
- How is mass a measure of the amount of inertia?
Read- Galileo's concept of inertia: Moving objects eventually stop because of a force called friction.
- Why forces don't keep objects moving: An object in motion on a flat surface does not stop because of the absence of a force; but because of the presence of a force (friction). In the absence of friction, the object would continue in motion with the same speed and direction forever.
- How mass is a measure of the amount of inertia: The tendency of an object to resist changes in its state of motion varies with mass. The more inertia an object has, the more mass it has. A more massive object has a greater tendency to resist changes in its state of motion.
Recite and reviewc) State of Motion
Survey
Questions
- What does the phrase "state of motion" mean?
Read- Inertia
- The tendency of an object to resist changes in its velocity
- The tendency of an object to resist accelerations
Recite and reviewd) Balanced and Unbalanced Forces
Survey
Questions
- What are balanced and unbalanced forces?
- What is equilibrium?
Read- Equilibrium: When there are no unbalanced forces acting upon an object and the object maintains its state of motion. It will not accelerate.
Recite and reviewHomework Assignment 2-Force and Its Representation (a-d):Method 4
a) The Meaning of ForceSurvey
Question
- What is the meaning of force?
- What are contact forces?
- What are at-a-distance-forces?
- What is a Newton?
Read- Meaning of force: A force is a push or pull upon an object resulting from the object's interaction with another object. When the interaction ceases, the two objects no longer experience the force.
- Contact forces: Contact forces result when the two interacting objects are perceived to be physically contacting each other.
- Examples: frictional forces, tensional forces, normal forces, air resistance forces, and applied forces.
- At-a-distance-forces: At-a-distance-forces result when the two interacting objects are not in physical contact with each other, but are able to exert a push or pull despite their physical separation.
- Examples: gravitational forces, electrical forces, magnetic forces.
- Newton: A Newton is a standard metric union that measures force.
external image u2l2a2.gif
Recite and reviewb) Types of Forces
Survey
Question
- What are the different types of forces?
- What is the different between weight and mass?
Read- Types of forces:
- Applied force - A force that is applied to an object by a person or another object.
- Gravity force - The force with which the earth, moon, or other massively large object attracts another object towards itself; weight of the object.
- Normal force - The support force exerted upon an object that is in contact with another stable object.
- Friction force -The force exerted by a surface as an object moves across it or makes an effort to move across it.
- Air resistance force - A special type of frictional force that acts upon objects as they travel through the air.
- Tension force - The force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.
- Spring force - The force exerted by a compressed or stretched spring upon any object that is attached to it.
- Mass vs. weight: Weight is the force of gravity acting upon an object and mass is the amount of matter that is contained by the object.
Recite and reviewc) Drawing Free-Body Diagrams
Survey
Question
- What are free-body diagrams?
- How do you draw free-body diagrams?
Read- Free-body diagrams: Vector diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.
- How to draw free body diagrams: The only rulefor drawing free-body diagrams is to depict all the forces that exist for that object in the given situation
- Identify which forces are present
- Determine the direction in which each force is acting
- Draw a box and add arrows for each existing force in the appropriate direction
- Label each force arrow according to its type and if there are repeating forces make sure to alter the name in some way, example: T1, T2
Recite and reviewd) Determining the Net Force
Survey
Question
- What is net force, and how do you determine an object's net force?
- How do you determine an object's net force?
Read- Net force: Net force is the vector sum of all the forces that act upon an object and is determined by finding this sum.
- Net force takes into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out
Recite and reviewHomework Assignment 3-Newton's Second Law of Motion (a, b):Method 4
a) Newton's Second LawSurvey
Question
- What is Newton's Second Law of Motion?
- What equation is used for Newton's Second Law?
Read- Newton's Second Law: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
- Fnet= mas*acceleration
Recite and reviewb) The Big Misconception
Survey
Question
- What is the big misconception?
Read- Newton's laws declare loudly that a net force (an unbalanced force) causes an acceleration; the acceleration is in the same direction as the net force
Recite and review